G C A T T A C G G C A T genes Article Mitochondrial DNA Haplogroups and Breast Cancer Risk Factors in the Avon Longitudinal Study of Parents and Children (ALSPAC) Vivienne Riley 1, A Mesut Erzurumluoglu 2,3 ID , Santiago Rodriguez 3 ID and Carolina Bonilla 3,4,5,* ID 1 MSc Genomic Medicine Programme, G7, College House, St Luke’s Campus University of Exeter, Exeter, Devon EX2 4TE, UK;
[email protected] 2 Genetic Epidemiology Group, Department of Health Sciences, University of Leicester, Leicester LE1 7RH, UK;
[email protected] 3 MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Oakfield House, Oakfield Grove, Bristol BS8 2BN, UK;
[email protected] 4 Integrative Cancer Epidemiology Program, Population Health Sciences, Bristol Medical School, University of Bristol, Oakfield House, Oakfield Grove, Bristol BS8 2BN, UK 5 Departamento de Medicina Preventiva, Faculdade de Medicina, Universidade de São Paulo, São Paulo 01246-903, Brazil * Correspondence:
[email protected] Received: 9 June 2018; Accepted: 27 July 2018; Published: 1 August 2018 Abstract: The relationship between mitochondrial DNA (mtDNA) and breast cancer has been frequently examined, particularly in European populations. However, studies reporting associations between mtDNA haplogroups and breast cancer risk have had a few shortcomings including small sample sizes, failure to account for population stratification and performing inadequate statistical tests. In this study we investigated the association of mtDNA haplogroups of European origin with several breast cancer risk factors in mothers and children of the Avon Longitudinal Study of Parents and Children (ALSPAC), a birth cohort that enrolled over 14,000 pregnant women in the Southwest region of the UK.